S (stall issue): During this level the turbine pace is zero and also the impeller is rotating; the effectiveness inside the stall position is minimum, around 50%, meaning that 50 % of the power coming from the motor is lost as a result of friction and dissipated as warmth; at https://torqueconverterclutch96317.azzablog.com/34147510/torque-converter-clutch-an-overview